The Secret of Moon Castle

“Well, he said we weren’t to let anyone in,” said the woman, and she turned to her tall companions, not knowing what to do. They held a hurried conference in whispers.
The children and Mrs. Arnold waited impatiently. How silly these women were!
The little plump woman turned round at last. “Well - I don’t know what my son will say,” she said again, “but I suppose I must let you in! I and my two sisters are the caretakers.”
“Yes - I’m afraid you must let us in and also take us round,” said Mrs. Arnold, firmly. “What does your son do here? Is he a caretaker too?”
“Oh no. My son is very, very clever,” said the little woman, proudly. “He is a scientist. I can’t tell you the number of exams he has passed.”
“Why does he bury himself here then?” said Mrs. Arnold, thinking that this mysterious son must be a spoilt and lazy fellow, living in luxury in the castle, waited on by the three women!
“He has work to do,” said the little woman, speaking proudly again. “Important work that needs quiet and peace. I don’t know what he’ll say if people come to live in the castle.”